KX-TPA65RU, KX-TPA65RUB - Panasonic Telephone Service Manual (repair manual). Page 13

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Base unit receives voice signal as "RX_DATA" from LAN and modurates it to RF signal in 1.9GHz.
RF signal is amplified and fed to Base unit's antenna.

RF signal from Base unit is received in two antennas in TPA65 and input  to Main MPU(IC1).  
RF parts of Main MPU(IC1) selects  the antenna to be used and demodulates RF signal to digital data "RX_DATA"
Main MPU(IC1) sends RX_DATA to Sub MPU(IC2) in TDM.
Sub MPU(IC2) converts RX_DATA into a voice signal and output it to selected Audio Path.

A voice signal from Audio Path is encoded to digital data "TX_DATA" by Sub MPU(IC2) in TPA65.
TX _DATA is sent from Sub CPU(IC2) to Main CPU(IC1) in TDM.
RF parts of Main MPU(IC1) modulates TX _DATA to  RF signal in 1.9GHz.
RF signal is amplified and fed to a selected antenna.

Base unit receives RF signal from TPA65 and demodulates it to digital data "TX_DATA". 

Main MPU(IC1)  has LNA, Power AMP, RF-Switch and baseband processing function.
Filtering of RF signal and matching for antenna are in RF Block.

Antenna divesity

DG

D3.2V

L101

51

VCC_PA

52

BAL_OUT2

53

BAL_OUT1

55

ANT1

56

GND_RF

57

ANT2

58

TEST

59

RX_SW

60

LNA_INN

61

LNA_INP

ATST_N

54

TX_SW

C422

RX_SW

LNA_INN

LNA_INP

C423

R402

C421

DG

DG

DG

C430

BAL_OUT2

C419

C417

VCC_PA

L411

C411

C418

TX_SW

BAL_OUT1

R401

DG

DG

DG

DG

DG

DG

DG

L410

NC

C416

C415

C429

C412

D402

ANT1

D401

ANT2

DG

DG

DG

DG

DG

DG

DG

DG

DG

DG

ANT_TP1

1

2

ANT_JP1

1     2

1     2

ANT_1

C425

DG

DG

DG

DG

DG

ANT_JP2

ANT_TP2

1

2

ANT_2

C427

DG

C420

C410

L416

DG

C405

C404

L403

C403

L402

C402

L401

C401

L414

L412

C424

C409

L406

C408

C407

L405

L404

C406

L415

0

C426

IC1

RF Block

TX_SW

VCC_PA

ANT1
ANT2

RX_SW

LNA_INN
LNA_INP

BAL_OUT2
BAL_OUT1