K-LC1a_V5_技术文档

Datasheet

K-LC1a_V4 DOPPLER TRANSCEIVER

Features



3.3V version of K-LC1a

24 GHz K-band miniature transceiver

100MHz sweep FM input

Dual 4 patch antenna

Single balanced mixer with 50MHz bandwidth

Beam aperture 80°/34°

15dBm EIRP output power

25x25mm²surface, 6mm thickness

3 pin version K-LC1a_V5 available on request

K-LC1a Actual Size

Applications



General purpose movement detectors

Security systems

Object speed measurement systems

Simple shortrange ranging detection

Highspeed shortrange data transmission

Industrial sensors

Description

K-LC1a is a 8 patch Doppler module with an

asymmetrical beam for lowcost short distance

applications. Its typical applications are move-

ment sensors in the security and automatic

door domain. In building automation this mod-

ule may be an alternative for infrared PIR or

AIR systems thanks to its outstanding per-

formance/cost ratio.

With its IF bandwidth from DC to 50MHz it

opens many new applications.

FM and FSK are possible thanks to the unique

RFbeam oscillator design. This allows to use

this lowcost module even in ranging applica-

tions.

A powerful starterkit with signal conditioning

and visualization is available from RFbeam.

Find more informations at www.rfbeam.ch.

The module is extremely small and lightweight.

Blockdiagram

Rx

Tx

K-LC1a

IF output

FM Input

Fig. 1: Block diagram (FM input not available on K-LC1a_V5)

Page 1/5

Datasheet

K-LC1a_V4 DOPPLER TRANSCEIVER

Characteristics

Parameter

Conditions / Notes

Symbol

Min

Typ

Max Unit

Operating conditions

Supply voltage

V_cc

I_cc

3.0

3.3

35

3.6

45

V

Supply current

VCO Pin open

mA

V

VCO input voltage

VCO pin resistance

Operating temperature

Storage temperature

U_vco

R_vco

T_op

T_st

-0.5

1.0

Driving voltage source ^{Note 1}

570



-20

+60

+80

°C

Transmitter

Transmitter frequency

Frequency drift vs temperature

Frequency tuning range

VCO sensitivity

VCO pin left open, T_amb=-20°C .. +60°C

V_cc=5.0V, -20°C .. +60°C ^{Note 2}

f_TX

24.050

24.125

-1

24.250

GHz

MHz/°C

MHz

MHz/V

MHz

dBm

s

 f_TX

 f_vco

S_vco

B_VCO

P_TX

180

-80

3

VCO Modulation Bandwidth

Output power

f=20MHz

EIRP

+12

+15

+17

+/- 1

-30

Output power deviation

Spurious emission

Full VCO tuning range

According to ETSI 300 440

Until oscillator stable, f_TX< 5MHz

 P_TX

P_spur

t_on

Turn-on time

1

Receiver

Mixer Conversion loss

f_IF= 1kHz, IF load = 1k

f_IF= 20MHz, IF load = 50

D_mixer1

D_mixer2

G_Ant

-6

-11

8.6

dB

Note 3

Antenna Gain

F_TX=24.125GHz

dB

Receiver sensitivity

f_IF=500Hz,B=1kHz,R_IF=1k,S/N=6dB

f_IF=1MHz,B=20MHz,R_IF=50,S/N=6dB

f_IF=500Hz,B=1kHz,R_IF=1k,S/N=6dB

P_RX1

-96

-84

-111

dBm

dBc

P_RX1

Overall sensitivity

D_system

IF output

IF resistance

R_IF

50



IF frequency range

IF noise power

-3dB Bandwidth, IF load = 50

f_IF=500Hz, IF load = 50

f_IF

0

50

MHz

P_IFnoise1

P_IFnoise2

U_IFnoise1

U_IF

-134

-164

-147

45

dBm/Hz

dBV/Hz

nV/Hz

mV

f_IF=1MHz, IF load = 50

IF noise voltage

f_IF=500Hz, IF load = 1k

IF output offset voltage

Supply rejection

Full VCO range, no object in range

Rejection supply pins to IF output

10

200

D_supply

26

dB

Page 2/5

Datasheet

K-LC1a_V4 DOPPLER TRANSCEIVER

Parameter

Antenna

Conditions / Notes

Symbol

Min

Typ

Max Unit

Horizontal -3dB beamwidth

E-Plane

H-Plane

W_

W_

D_

D_

80

34

°

Vertical -3dB beamwidth

°

Horiz. sidelobe suppression

Vertical sidelobe suppression

-12

dB

Body

Outline Dimensions

Weight

25*25*6

4.5

mm³

g

Connector

5pin single row jumper

Note 1 The VCO input has an internal voltage source with approx. 0.9VDC. For driving this pin it is necessary to source and

sink current

Note 2 Transmit frequency stays within 24.050 to 24.250GHz over the specified temperature range when the VCO pin

is left open

Note 3 Theoretical value, given by Design

Antenna System Diagram

This diagram shows module sensitivity

in both azimuth and elevation direc-

tions. It incorporates therefore the

transmitter and receiver antenna char-

acteristics.

Fig. 2: System diagram

Page 3/5

Datasheet

K-LC1a_V4 DOPPLER TRANSCEIVER

FM Characteristics

VCO Voltage generates an output signal even without an object in range because of the finite isolation

between transmitter and receiver path. This effect is called self-mixing and leads to a DC signal that

depends on the carrier frequency / the VCO voltage.

Pin Configuration

1 *)

Description

nc

Typical Value

---

2

3

4

VCC

IF output

GND

3.3VDC supply

load 1kOhm

ground

5 *)

VCO in

Open = f₀

*) not present in the option K-LC1a_V5

Outline Dimensions

Fig. 3: Mechanical data

Page 4/5

Datasheet

K-LC1a_V4 DOPPLER TRANSCEIVER

Application Notes

Sensitivity and Maximum Range

The values indicated here are intended to give you a 'feeling' of the attainable detection range with this

module. It is not possible to define an exact RCS (radar cross section) value of real objects because

reflectivity depends on many parameters. The RCS variations however influence the maximum range

4

only by

.



Maximum range for Doppler movement depends mainly on:

- Module sensitivity

- Carrier frequency

- Radar cross section RCS ("reflectivity") of the object

S:

f₀:

¹⁾:

-114dBc (@0.5kHz IF Bandwidth)

24.125GHz

1m²approx. for a moving person

>50m²for a moving car

note ¹⁾RCS indications are very inaccurate and may vary by factors of 10 and more.

The famous "Radar Equation" may be reduced for our K-band module to the following relation:

s

r  0.0167 10⁴⁰ ⁴

Using this formula, you get an indicative detection range of

- 12 meters for a moving person.

- > 31 meters for a moving car

Please note, that range values also highly depend on the performance of signal processing,

environment conditions (i.e. rain, fog), housing of the module and other factors.

For simple detection purposes (security applications e.g.) without the need of speed measurements,

range may be enhanced by further reducing the IF bandwidth. With 250Hz bandwidth and a simple

comparator, we get already a 25m detection range.

EC-Declaration of Conformity

This product complies with the essential requirements of the RED Directive 2014/53/EU, and can be

used in all countries within Europe.

Ordering Information

3.3V device part #

K-LC1a_V4

3.3V 3-pin version part#

K-LC1a_V5 (not on stock)

Datasheet Revision History

Version

1.0

Date

Changes

03-Sept-2013 initial release

1.1

1.2

1.3

1.4

08-Jan-2014

24-Oct-2014

28-Jun-2017

06-Apr-2018

corrected in table Pin Configuration VCC to 3.3V

Added part K-LC1a_V5

Directive 2014/53/EUR and full address added

Outer Oultine Dimensions corrected

RFbeam does not assume any responsibility for use of any circuitry described, no circuit patent licenses are implied and

RFbeam reserves the right at any time without notice to change said circuitry and specifications.

Page 5/5


型号：	K-LC1a_V5
厂家：	RFbeam Microwave GmbH
描述：	DOPPLER TRANSCEIVER
文件：	总5页 (文件大小：440K)
中文：	中文翻译
下载：	下载PDF数据表文档文件

K-LC1a_V5 [RFBEAM]

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